Boiler



Nov. 3, 1931.

J. H. LAWRENCE 1,830,169

BOILER Filed July 14 1925 2 Sheets-Sheet 'l avwemtoz Nov. 3, 1931.

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atentecl- Nov. 3, 1931 PATENT OF ICE- d'QlEilll' H. LAWRENCE, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, T METROPULITAN ENGNG- COMPANY, A CORPORATION OIENEW YORK BQILER Application filed July It,

Tn certain previous applications for pat: ent otfThomas E. Murray (Number 67 8 ,443 and others) there are described furnaces owith walls oftubular or hollow construction for carrying water to be heated or boiled or steam to be superheated, these being referred to herein generally as water walls or walls of water tubes. The present invention is directed to a form of construction of such water walls. The accompanying drawings illustrate an embodiment of the invention.

Fig. 1 is a longitudinal section of a boiler;

Fig. 2 is a transverse section thereof;

Fig. 3 is an enlarged transverse section of a detail; 4 V I l is a detail of the tubes in perspective.

Referring to the embodiment, of the invention illustrated the furnace has a front wall 1 offset from the tubing by an ar'ch 2 at its upper end through which project burner nozzles 3 for injecting jets of pulverized coal, oil, gas or similar fuel. The furnace has a rear wall i and side walls 5 (Fig. 2). These walls are of any usual or suitable construction and material, as are the walls and roof of the upper part of the boiler. Above the combustion chamber are sets of the usual inclined, approximately g horizontal, water tubes b and superheater tubes 7 with baes for properly directing the gases of combustion from the furnace around the tubes to heat them by convection and for finally directing the gases outward by the smoke pipe 8 to the exhaust fan or stack.

The horizontal tubes described are suppleinented by tubes arranged along one'or more sides of the combustion chamber of ant heat of the burning fuel, The present invention provides means for bracing such tubes so as to permit the use of tubes and walls of considerable length without buckling; or, stated in another way, to build the water wall in successive units of comparatively short tubes. In the case illustrated water-walls are space between them. Thus the water wall is exposed to the heat on one face only and atfords substantial protection to the outside wall 5. It will be observed that the side walls 5 are made much lighter than the end wall 1- which is not thus protected. The invention may be applied also to the protection of the end walls, or in fact to any wall or walls of the furnace. The fins provide a great increase in the area of conducting material exposed to the intense radiant heat of the furnace. Each tube with its fins is mechanically separate from the adjacent tubes so as to all low for separate movement and for separate removal and insertion.

Continuous circulation is provided through the lower and upper tubes 9 and 10 by means ofa header 12 interposed between them, the ends of the tubes being expanded or otherwise firmly connected with the opposite walls of the header. The header is braced on the outside and is covered on the inside by means of refractory tiles 13 held in place by en gagement with a flanged plate 14: on the inner taceof the header.

0n the outside isa fixed channel bar 15 which supports the header and braces it the furnace and exposed directly to the radiagainst extreme deflection either outward or inward. At intervals in the length of the header 12 it is connected to rods 16 passing through plates 17 and 18 on the faces of the channel bar. Springs 19 and 20 on the rod 16 bear againstthe plates 17 and 18 respec tively and against adjustable collar 21 and washer 22. on the rod. These springs provide yielding braces against outward and inward deflection.

The lower ends of the tubes 9 enter headers 23 and the upper ends ofthe tubes 10 enter headers 24. The circulation is upward from the front ends of the headers 24 by pipes 25 to a header 26 from which pipes 27 lead to the steam drum 28. The water therefrom passes through the headers at the lower ends of the inclined tubes 6, down to a header 29, Fig, 1, from the ends of which pipes 30 pass downward and to the back of the furnace and into the rear ends of the headers 23; whence the circulation is upward through the pipes 9, headers 12 and pipes 10. The head ers 28 at the lower ends of the water walls, and the lower portions of the pipes 9 forming such walls, are protected by a shield 31 of refractory tiles from the direct heat of the furnace. The upper ends of tubes 10 are similarly protected, the headers 24 being set in recesses formed in the outer faces and shielded on the inside by a portion 82 of the wall of refractory material. The recesses enclosing the headers 24: may be covered on the outside by plates 33 and similar covers may be provided outside of the lower headers 23.

Various modifications may be made by those skilled in the art without departing from the invention as defined in the following claims.

What I claim is:

1. A boiler having a furnace in which is a jointed water wall exposed to the radiant heat of the burning fuel and yielding means for bracing said wall at the joint against lateral deflection.

2. A boiler having a furnace in which is a water wall exposed to the radiant heat of the burning fuel and comprising two sets of tubular elements in line with each other and a header between them common to all the tubular elements of each set and located in the same plane with said tubular elements and yielding means for opposing lateral movement of said header.

3. A boiler having a furnace in which is a water wall comprising two sets of tubular elements in line with each other and a header between them common to all the tubular elements of each set and located in the same plane with said tubular elements, and the tubular elements being exposed above and below the header to the radiant heat of the burning fuel, refractory material shielding the header on the inside and lateral supporting means for said header on the outside.

4. A boiler having a furnace in which is a' water wall comprising two sets of tubular elements in line with each other, a header between them and lateral bracing means on the outside for limiting outward deflection of said header, said header extending across the full width of the wall and being common to all the tubular elements of each set.

5. A boiler having a furnace in which is a water wall comprising two sets of tubular elements in line with each other, a header between them and lateral bracing means comprising a fixed bar outside of said header, and means between the bar and header for resisting lateral deflection of the header.

6. A boiler having a furnace with an imperforate refractory wall, a water wall shielding said refractory wall and compris ing two sets of vertically extending steam generating tubes, each set occupying substantially the full width of the wall, a header connection between them also occupying substantially the full width of the wall, a steam drum and circulating pipes for conducting the wet steam from the upper end of the water wall to the drum and for conducting water from the drum to the lower end of the water wall.

7. A boiler having a furnace with an imperforate refractory wall, and a water wall shielding said refractory wall and comprising two sets of Vertically extending steam generating tubes, each set occupying substantially the full width of the wall, and a header connection between them and in the same plane with them also occupying substantially the full width of the wall.

8. A boiler having a furnace with an imperforate refractory wall and a water wall shielding said refractory wall and comprising two sets of vertically extending steam generating tubes, each set occupying substantially the full width of the wall, a header connection between them and in the same plane with them also occupying substantially the full width of the wall, headers at the top of the upperset of tubes and at the bottom of the lower set, all said headers being in line with the tubes, and means for shielding all said headers on their inner faces while leaving the tubes exposed.

9. A boiler having a furnace with an imperforate refractory wall and a water wall comprising two sets of vertically extending steam generating tubes, each set occupying substantially the full width of the wall and completely shielding the refractory wall from exposure to the radiant heat of the burning fuel, a header connection between said two sets of tubes also occupying substantially the full width of the wall, a steam drum and circulating pipes for conducting the wet steam from the upper end of the water wall to the drum and for conducting water from the drum to the lower end of the water wall.

10. A boiler having a furnace with an imperforate refractory wall, a water wall shielding said refractory wall and comprising two sets of vertically extending steam generating tubes, each set occupying substantially the full width of the wall, a header connection between them also occupying substentiefiy the full Width of the well, water tubes heated by convection from the gases passing out of the furnace, a steam flrum, circulating pipes for conducting steam from said convection tubes to said drum and separate circulating pipes for conducting steam from the upper end of said water Well to the drum and circulating pipes for conducting Water from the drum to the Water Well end to the convection tubes.

"In Witness whereof I have hereunto siguedl my name,

JUHN Ho LAENCE, 

